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geochronology

A Dictionary of Earth Sciences | 1999 | | Copyright

geochronology Determination of time intervals on a geologic scale, through either absolute or relative dating methods. Absolute dating methods involve the use of radioactive elements and knowledge of their rates of decay: this yields an actual age in years for a given rock or fossil. Relative dating involves the use of fossils or sediments to place events and rock sequences in order, and does not provide absolute dates. See also DATING METHODS; ABSOLUTE AGE; RELATIVE AGE; PLANKTONIC GEOCHRONOLOGY; and GEOCHRONOMETRY.

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AILSA ALLABY and MICHAEL ALLABY. "geochronology." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "geochronology." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-geochronology.html

AILSA ALLABY and MICHAEL ALLABY. "geochronology." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-geochronology.html

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geochronology

A Dictionary of Ecology | 2004 | | Copyright

geochronology The determination of time intervals on a geologic scale, through either absolute or relative dating methods. Absolute dating methods involve the use of radioactive elements and knowledge of their rates of decay: this yields an actual age in years for a given rock or fossil. Relative dating involves the use of fossils or sediments to place events and rock sequences in order, and does not provide absolute dates.

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MICHAEL ALLABY. "geochronology." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "geochronology." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-geochronology.html

MICHAEL ALLABY. "geochronology." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-geochronology.html

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geochronometric scale

A Dictionary of Earth Sciences | 1999 | | Copyright

geochronometric scale (chronometric scale) A time-scale based on years BP (conventionally before 1950). Subdivisions on the scale are defined by particular units of duration (e.g. 10⁶ years, 10⁹ years) rather than reference points in actual rock successions. An example of such a subdivision is the placing of the boundary between the Archaean and the Proterozoic at 2500 Ma (i.e. 2500 × 10⁶ years) ago.

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AILSA ALLABY and MICHAEL ALLABY. "geochronometric scale." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "geochronometric scale." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-geochronometricscale.html

AILSA ALLABY and MICHAEL ALLABY. "geochronometric scale." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-geochronometricscale.html

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geochronometric scale

A Dictionary of Ecology | 2004 | | Copyright

geochronometric scale(chronometric scale) A time-scale based on years bp (conventionally before 1950). Subdivisions on the scale are defined by particular units of duration (e.g. 10⁶ years, 10⁹ years) rather than reference points in actual rock successions. An example of such a subdivision is the placing of the boundary between the Archaean and the Proterozoic at 2500 Ma (i.e. 2500 × 10⁶ years) ago.

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MICHAEL ALLABY. "geochronometric scale." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "geochronometric scale." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-geochronometricscale.html

MICHAEL ALLABY. "geochronometric scale." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-geochronometricscale.html

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geochronometry

A Dictionary of Earth Sciences | 1999 | | Copyright

geochronometry The determination of the length of time intervals. Geochronometric resolutions for zonations based on different organisms may be calculated by dividing the time-span of a series by the number of zones and the intervals between zones. However, this will give only an approximate measure of time. See also DATING METHODS; and GEOCHRONOLOGY.

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AILSA ALLABY and MICHAEL ALLABY. "geochronometry." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "geochronometry." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-geochronometry.html

AILSA ALLABY and MICHAEL ALLABY. "geochronometry." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-geochronometry.html

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geochronometry

A Dictionary of Ecology | 2004 | | Copyright

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MICHAEL ALLABY. "geochronometry." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "geochronometry." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-geochronometry.html

MICHAEL ALLABY. "geochronometry." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-geochronometry.html

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geochronology

A Dictionary of Biology | 2004 | Copyright

geochronology See varve dating.

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"geochronology." A Dictionary of Biology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"geochronology." A Dictionary of Biology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O6-geochronology.html

"geochronology." A Dictionary of Biology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-geochronology.html

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